Debugging Macros

[Tom Browder]

I'm trying to debug a gcc frontend (cobol for gcc) and get errors such as:

../../gcctrunk_with_cobol/gcc/cobol/cobcbei.c:462: error: invalid
application of 'sizeof' to incomplete type 'struct lang_identifier'
../../gcctrunk_with_cobol/gcc/cobol/cobcbei.c:462: error: 'getdecls'
undeclared here (not in a function)
../../gcctrunk_with_cobol/gcc/cobol/cobcbei.c:468: error: conflicting
types for 'tree_code_type'

which come from nested macros in gcc code.

Is there an easy way (such as defining an environment variable in the
build environment) to get the gcc build system to show the
preprocessed code to help backtrack the problem?

If not, any ideas to avoid laborious file-at-a-time handling?

Thanks.

-Tom